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Fits 45 HP 3cyl Jet Mercury/Mariner 1991-99 models with Serial # OD000750 thru OG589999: 134-9021-3 is an ignition trigger. Helps synchronize ignition timing with crankshaft position.
Representative image shown. Brand or product appearance may vary slightly depending on current inventory.

Part #: 134-9021-3
Mercury45 HPTriggerWeight: 1 lb
4.0 / 5  (10 votes)
Fits 45 HP 3cyl Jet Mercury/Mariner 1991-99 models with Serial # OD000750 thru OG589999: 134-9021-3 is an ignition trigger. Helps synchronize ignition timing with crankshaft position.
List Price: $153.99
Your Price: $139.95
Normally In Stock

In Stock items ship same day if ordered before 3PM CST (excluding weekends and holidays)

Replaces OEM#'s

99021A3, 99021A5, 99021A9, 99021A13, 99021A15, 99021A16

Product Details

Designed for reliable ignition synchronization, this marine trigger helps coordinate spark timing events across the engine's RPM range.

The assembly uses vibration-resistant electronic components and insulated signal wiring designed for dependable timing performance in marine applications.

Features

  • Supports accurate CDI timing events
  • Precision ignition timing signal generation
  • Vibration-resistant electronic components
  • Marine-grade sealed construction

Common Symptoms of a Failing Trigger

  • Engine misfire or hesitation
  • Ignition timing drift after warm-up
  • Loss of spark synchronization
  • Intermittent ignition timing problems

Need Fitment Help?

Tell us your brand, horsepower, and part number. We can help verify fitment before you order.

Support PDF files appear on this page when available.